World Cleanup Day
World Cleanup Day is held on September 20. The third Saturday of September. This event in the second decade of the month September is annual. 
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World Cleanup Day is celebrated with litter cleanup and waste mapping activities spanning every time zone. Environmental cleanup events are held in nearly every country until concluding near the international date line in Hawaii and American Samoa.
Similar holidays and events, festivals and interesting facts
International Grenache Day on September 19 (Celebrated on the 3rd Friday in September);
World Marrow Donor Day on September 20 (is celebrated globally on the third Saturday of September);
International Eat An Apple Day on September 20 (Third Saturday of Septembe);
International Coastal Cleanup Day on September 20 (Held on the third weekend of September);
International Day of University Sport on September 20
National Canal Conservation Day in Thailand on September 20
World Alzheimer's Day on September 21
World Gratitude Day on September 21 (First celebrated in 1965);
European Cooperation Day on September 21
Feast of the Nativity of the Virgin on September 21 (Orthodox Church);
International Day of Struggle against Monoculture Tree Plantations on September 21
Zero Emissions Day on September 21
Arbor Day in Brazil on September 21